<!DOCTYPE HTML>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <title> 鼠标经过事件 </title>
  <script type="text/javascript">
    function message() {
      confirm("请输入密码后，再单击确定!");
    }
  </script>
</head>

<body>
  <form>
    密码:<input name="password" type="password">
    <input name="确定" type="button" value="确定" onmouseover="message()" />
  </form>
</body>

</html>